Equilibrium Constant Calculator

You can use this equilibrium constant calculator to learn about reversible chemical reactions.

Enter the concentrations and coefficients to find the equilibrium constant.

Reversible chemical reactions are those reactions in which both the forward and reverse reactions take place at the same time.

a[A] + b[B] ⇌ c[C] + d[D]

Determining the equilibrium constant for a reaction helps determine the ratio of substances created at equilibrium.

Equilibrium Constant Calculator

You might want to calculate the temperature of the reaction or pressure of the reactions.


  • Bigeleisen, J., & Mayer, M. G. (1947). Calculation of equilibrium constants for isotopic exchange reactions. The Journal of Chemical Physics, 15(5), 261-267.
  • Mayr, H., & Ofial, A. R. (2016). Philicities, fugalities, and equilibrium constants. Accounts of Chemical Research, 49(5), 952-965.
  • Hammett, L. P. (1935). Some relations between reaction rates and equilibrium constants. Chemical reviews, 17(1), 125-136.
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